Send email.
Own the tool.
A local-first bulk mailer that runs on your machine, with your SMTP, using your data. Pay once, send forever.
- Runs on your machine
- One payment, no subscriptions
- Your SMTP, your data
Everything you need.
Nothing you don't.
Built to be simple on the surface and powerful when you need it. No dashboards to learn, no settings to misconfigure.
Bulk sending engine
Multi-threaded SMTP with configurable throttles, backoff, retries and MX validation. Send 100 or 100,000 — the engine doesn't care.
up to 5 parallel threadsSchedule & resume
Queue sends for later. Pause mid-send, resume hours later. Dedup against a sent-registry so no one gets an email twice.
persistent sessionsHTML & plaintext templates
Write raw HTML, plain text, or compose with reusable blocks. Live preview. Variable interpolation — {{name}}, {{company}}.
code editor includedLocal analytics
Delivery rate, opt-outs, failures, per-session timing. All stored locally in SQLite. Export whenever you want.
sqlite · exportableA/B subject testing
50/50 split-tests for subject lines. Watch the open-rate delta in real time. No per-test upcharges.
no extra costBring your own SMTP
Brevo, Mailgun, SendGrid, Postmark, Gmail, or your own relay — configure unlimited accounts and rotate freely.
unlimited accountsSimple to use.
Powerful underneath.
Know exactly what landed.
A clean dashboard shows exactly what was delivered, when, and what failed — no spreadsheets required.
- One-click exports — download your results as CSV any time.
- Failure reasons — clear, plain-language diagnostics for bounces.
- Session history — every campaign, searchable.
Write once.
Send to everyone.
Templates with reusable blocks and personalization. Side-by-side preview shows exactly what each recipient sees.
- Block system — compose headers, footers, CTAs once; reuse everywhere.
- Variable interpolation — {{name}}, {{company}}, {{custom}} — fallbacks built in.
- Side-by-side preview — see exactly what your recipient sees.
Blocks
Hi Alex,
We just shipped a new release for Northwind Labs — and we think you'll want to see it first.
Pay once.
Save thousands.
Most tools charge every month, forever. We charge once. Here's what that looks like over three years.
- One-time payment, forever
- Unlimited sends, no tiers
- Your list stays on your disk
- Monthly subscription, no end
- Price scales with contacts
- List lives on their servers
You save $5,285 over 3 years. That's about 98% less.
Three steps.
That's the whole flow.
Create a campaign
Import recipients from CSV or TXT. Pick a template or write one. Add attachments. Pick your SMTP account.
Hit send — or schedule
Watch every message leave, in real time. Pause, resume, retry failed at any moment.
Track the results
Delivery rate, failures, opt-outs — all recorded per-session. Everything exportable. Nothing phones home.
Pay once.
Use forever.
No subscriptions. No per-contact fees. No seats. Buy the license, own the app.
- Unlimited sends & recipients
- Unlimited SMTP accounts
- Templates, scheduler, A/B tests
- 1 year of free updates
- macOS · Windows · Linux
- Everything in Solo
- 5 machine activations
- Shared template library
- Priority email support
- 2 years of free updates
- Commercial use license
14-day refund · Secure checkout · Instant download · No account required
Questions,
answered.
Buy it once.
Send forever.
Stop paying every month for a tool you could just own. Download the binary, punch in your SMTP, press send.
14-day refund · Instant download · No sign-up